Appearing on the cover of Harper's Bazaar in two gorgeous dresses, Kate Hudson reveals she "can't afford to buy" all the expensive red carpet gowns she wears Credit: Alexi Lubomirski for Harper’s BAZAAR

A-list celebrities may appear to have it all, but as Kate Hudson reveals in the December/January issue of Harper's Bazaar (on stands Nov. 26), those appearances can be deceiving. The Something Borrowed actress, 34, looks incredible on the magazine's subscriber's cover in a glittering purple and red sequined Givenchy by Riccardo Tisci gown with a plunging neckline -- but that gown, like many others Hudson has rocked in the past, is just a loan.

"People think we own all these dresses, but we borrow them!" she explains of her stunning red carpet style. "I can't afford to buy that stuff. There are certain things I splurge on, but it's very rare, especially when you have two kids and school tuition."

(The Oscar nominee has a 9-year-old son, Ryder, from her marriage to first husband Chris Robinson, as well as a 2-year-old son, Bingham, with fiance Matthew Bellamy.)

"I'm not a big high-end fashion shopper," she confesses. "I wish I could, but the truth is, things are just so expensive. Before [designer] Isabel Marant was a million dollars and famous, I used to go to her store in Paris and go crazy, it was so affordable."

The actress, who also showcases her slim bod in a cleavage-baring Lanvin dress for the magazine's newsstand cover, says she learned from her mother, Goldie Hawn, to spend money wisely. "My mom wasn't a big shopper for us," Hudson shares. "I think [she] wanted to instill that in us even though we grew up in a really privileged and lucky lifestyle."

Now that she's older, the engaged star has a family of her own to raise. "I'm loving becoming an adult," she gushes.

Another thing she loves? Staying active. "It really is a vital part of my day in terms of energy," she tells Harper's Bazaar of regular exercise. "And I mean just by putting a sports bra on. Then maybe you'll do something! Even if it's a few squats in the backyard and back to the couch."